Power demand of Industries is somewhat unlogic to me.
a 1k "poducing"/selling ice cream parlor needs 2.000 Electricity for only +10% while a 30k Oil-Refinery needs 6.000 for a +200% boost.
While others like Prison and Patients chain buildings need less than 10 (ten) for +100%.

if 1l Oil = 0,001m^3 = 10kWh = 10 Power/h then a 300MW Oil Power plant (40%) would need only 1800m^3 per ingame month (scale 24h = 1 month)

for me it would make more sense if the demand is 0.5*goods*boost for nonpoducing ones (eg. doctor's office 50 patients: 50*0.5*100% = 25, Market with 5x1k selling goods: 5000*0.5*100% = 2500,...., Fields,...)
and 2*goods*boost for producing one (e.g. Oil-Refinery 30k: 30k*2*200% = 120k eq. to 120MW, Mines,...)